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        <p>代码来自刘铁猛老师的视频课程,之后会更新C#事件的笔记，目前有些东西还没有搞明白，权且放一放，待时间充裕时再做研究。<br><a id="more"></a><br><figure class="highlight csharp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">using</span> System;</span><br><span class="line"><span class="keyword">using</span> System.Threading;</span><br><span class="line"></span><br><span class="line">namespace @event</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">class</span> <span class="title">Program</span></span><br><span class="line">    &#123;</span><br><span class="line"></span><br><span class="line">        <span class="comment">/*这是一个模拟顾客进店点餐的代码：</span></span><br><span class="line"><span class="comment">         代码功能按照以下顺序实现：</span></span><br><span class="line"><span class="comment">         顾客进店，坐下，思考，然后呼叫服务员点餐，服务员记账，用餐完毕付账。  */</span></span><br><span class="line">        <span class="function"><span class="keyword">static</span> <span class="keyword">void</span> <span class="title">Main</span>(<span class="params"><span class="built_in">string</span>[] args</span>)</span></span><br><span class="line"><span class="function"></span>        &#123;</span><br><span class="line">            Customer customer = <span class="keyword">new</span> Customer();<span class="comment">//实例化事件的拥有着：顾客</span></span><br><span class="line">            Waiter waiter = <span class="keyword">new</span> Waiter();<span class="comment">//实例化事件的订阅者：服务员</span></span><br><span class="line">            customer.Order += waiter.Action;<span class="comment">//绑定事件的处理器（订阅事件）</span></span><br><span class="line">            customer.Action();<span class="comment">//顾客：开始行动</span></span><br><span class="line">            customer.PayTheBill();<span class="comment">//顾客：付款</span></span><br><span class="line">            Console.ReadLine();<span class="comment">//暂停程序显示数据</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/*声明一个订单（点餐事件的信息），包含菜名和分量两个信息*/</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">class</span> <span class="title">OrderEventArgs</span> : <span class="title">EventArgs</span><span class="comment">//并不强制，但规定凡事件的信息需继承自EventArgs类</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">public</span> <span class="built_in">string</span> DishName &#123; <span class="keyword">get</span>; <span class="keyword">set</span>; &#125;<span class="comment">//菜名</span></span><br><span class="line">        <span class="keyword">public</span> <span class="built_in">string</span> Size &#123; <span class="keyword">get</span>; <span class="keyword">set</span>; &#125;<span class="comment">//分量</span></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/*声明订餐的委托类，注意这是个类，不要声明在其他类中*/</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="built_in">delegate</span> <span class="keyword">void</span> <span class="title">OrderEventHander</span>(<span class="params">Customer customer, OrderEventArgs e</span>)</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/*声明顾客类，其包含以下信息</span></span><br><span class="line"><span class="comment">     订餐事件、走进餐馆、坐下、思考、呼叫服务员点餐的方法，并有付账方法以及一个记录款项总额的字段用于记录服务员提供的订单*/</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">class</span> <span class="title">Customer</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">private</span> OrderEventHander orderEventHander;<span class="comment">//声明委托成员，用于记录收听订餐事件的方法</span></span><br><span class="line"></span><br><span class="line">        <span class="keyword">public</span> <span class="keyword">event</span> OrderEventHander Order<span class="comment">//声明点餐事件（事件成员）</span></span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">add</span><span class="comment">//添加收听该事件的方法</span></span><br><span class="line">            &#123;</span><br><span class="line">                <span class="keyword">this</span>.orderEventHander += <span class="keyword">value</span>;</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="keyword">remove</span><span class="comment">//移除收听该事件的方法</span></span><br><span class="line">            &#123;</span><br><span class="line">                <span class="keyword">this</span>.orderEventHander -= <span class="keyword">value</span>;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="comment">//这里很像属性</span></span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">public</span> <span class="built_in">double</span> Bill &#123; <span class="keyword">get</span>; <span class="keyword">set</span>; &#125;<span class="comment">//声明一个用于记录服务员回传款项的字段</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">PayTheBill</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span>        &#123;</span><br><span class="line">            Console.WriteLine(<span class="string">&quot;Customer：I will pay $&#123;0&#125;.&quot;</span>, <span class="keyword">this</span>.Bill);</span><br><span class="line">        &#125;<span class="comment">//顾客埋单</span></span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">Walkin</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span>        &#123;</span><br><span class="line">            Console.WriteLine(<span class="string">&quot;Customer：Walk in the restaurant.&quot;</span>);</span><br><span class="line">        &#125;<span class="comment">//顾客走进餐馆</span></span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">SetDown</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span>        &#123;</span><br><span class="line">            Console.WriteLine();</span><br><span class="line">        &#125;<span class="comment">//顾客坐下</span></span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">Think</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span>        &#123;</span><br><span class="line">            <span class="keyword">for</span> (<span class="built_in">int</span> i = <span class="number">0</span>; i &lt; <span class="number">5</span>; i++)</span><br><span class="line">            &#123;</span><br><span class="line">                Console.WriteLine(<span class="string">&quot;Customer：Let me think...&quot;</span>);</span><br><span class="line">                Thread.Sleep(<span class="number">1000</span>);</span><br><span class="line">            &#125;<span class="comment">//顾客想了5秒</span></span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span> (<span class="keyword">this</span>.orderEventHander != <span class="literal">null</span>)<span class="comment">//排除无方法收听的情况</span></span><br><span class="line">            &#123;</span><br><span class="line">                OrderEventArgs e = <span class="keyword">new</span> OrderEventArgs();<span class="comment">//实例化一个订单信息</span></span><br><span class="line">                e.DishName = <span class="string">&quot;Kongpao Chicken&quot;</span>;<span class="comment">//顾客点了宫保鸡丁</span></span><br><span class="line">                e.Size = <span class="string">&quot;large&quot;</span>;<span class="comment">//大份宫保鸡丁</span></span><br><span class="line">                <span class="keyword">this</span>.orderEventHander.Invoke(<span class="keyword">this</span>, e);<span class="comment">//呼叫服务员（执行订餐委托）</span></span><br><span class="line">            &#125;</span><br><span class="line">        &#125;<span class="comment">//顾客思考并下单</span></span><br><span class="line"></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">Action</span>(<span class="params"></span>)<span class="comment">//顾客进店以来点餐前的行动</span></span></span><br><span class="line"><span class="function"></span>        &#123;</span><br><span class="line">            <span class="keyword">this</span>.Walkin();</span><br><span class="line">            <span class="keyword">this</span>.SetDown();</span><br><span class="line">            <span class="keyword">this</span>.Think();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/*声明一个服务员类，包含以下信息：</span></span><br><span class="line"><span class="comment">     服务员收听到顾客的召唤（执行订餐委托）所执行的方法*/</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">class</span> <span class="title">Waiter</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">Action</span>(<span class="params">Customer customer, OrderEventArgs e</span>)<span class="comment">//收听订餐委托的方法，接受顾客身份和一道菜的订单</span></span></span><br><span class="line"><span class="function"></span>        &#123;</span><br><span class="line">            Console.WriteLine(<span class="string">&quot;Waiter：I will serve you the dish -&#123;0&#125;&quot;</span>, e.DishName);<span class="comment">//为顾客报菜名</span></span><br><span class="line">            <span class="built_in">double</span> price = <span class="number">10</span>;<span class="comment">//设置基准价格</span></span><br><span class="line">            <span class="keyword">switch</span> (e.Size)<span class="comment">//大份菜是基准价格的1.5倍，小份菜是基准价格的0.5倍</span></span><br><span class="line">            &#123;</span><br><span class="line">                <span class="keyword">case</span> <span class="string">&quot;small&quot;</span>:</span><br><span class="line">                    price *= <span class="number">1.5</span>;</span><br><span class="line">                    <span class="keyword">break</span>;</span><br><span class="line">                <span class="keyword">case</span> <span class="string">&quot;large&quot;</span>:</span><br><span class="line">                    price *= <span class="number">0.5</span>;</span><br><span class="line">                    <span class="keyword">break</span>;</span><br><span class="line">                <span class="literal">default</span>: <span class="keyword">break</span>;</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            customer.Bill += price;<span class="comment">//为顾客的账单添加一道菜的款项</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/*</span></span><br><span class="line"><span class="comment">     * 事件的拥有者：Customer</span></span><br><span class="line"><span class="comment">     * 事件成员：Order</span></span><br><span class="line"><span class="comment">     * 事件的响应者：Waiter</span></span><br><span class="line"><span class="comment">     * 事件处理器：wait.Action(Customer customer, OrderEventArgs e)</span></span><br><span class="line"><span class="comment">     * 事件订阅：customer.Order += waiter.Action;</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h2 id="运行结果："><a href="#运行结果：" class="headerlink" title="运行结果："></a>运行结果：</h2><p><a target="_blank" rel="noopener" href="http://upane.cn/archives/946/event_2018-11-19_23-02-56"><img src="http://47.94.231.166/wp-content/uploads/2018/11/@event_2018-11-19_23-02-56.png" alt=""></a></p>

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